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Unit 5 Scienece
Unit 5 Science
51
Science
8th Grade
02/04/2011

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Term
Atom
Definition
The smallest unit of an element that maintains the properties of that element
Term
Atomic Mass
Definition
The mass of an atom expressed in atomic mass units
Term
Atomic Mass Unit
Definition
a unit of mass that describes the mass of an atom or molecule
Term
Atomic Number
Definition
The number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element
Term
Boiling
Definition
The conversion of a liquid to a vapor when the vapor pressure of the liquid equals the atmospheric pressure
Term
Boyle's Law
Definition
The law that states that the volume of a gas is inversely proportional to the pressure of a gas when temperature is constant
Term
Charles's Law
Definition
The law that states that the volume of a gas is directly proportional to the temperature of a gas when pressure is constant
Term
Chemical Change
Definition
A change that occurs when one or more substances change into a entirely new substances with different properties
Term
Chemical Property
Definition
A property of matter that describes a substance's ability to participate in chemical reactions
Term
Compound
Definition
A substance made up of atoms of two or more different elements joined by chemical bonds
Term
Concentration
Definition
The amount of a particular substance in a given quantity of a mixture, solution, or ore
Term
Condensation
Definition
The change of state from the gas to a liquid
Term
Density
Definition
The ratio of the mas of a substance to the volume of the substance
Term
Electron
Definition
A subatomic particle that has a negative charge
Term
Element
Definition
A substance that cannot be separated or broken down into simpler substances by chemical means
Term
Evaporation
Definition
The change of a substance from a liquid to a gas
Term
Gas
Definition
A form of matter that does not have a definite volume or shape
Term
Group
Definition
A vertical column of elements in the periodic table; elements in a group share chemical properties
Term
Inertia
Definition
The tendency of an object to resist being moved or, if the object is moving, to resit a change in speed or direction until an outside force acts on an object
Term
Isotope
Definition
An atom that has the same number of protons as outher atoms of the same element do but that has a different number of newtrons / differnt atomic mass
Term
Liquid
Definition
the state of mater that has difinite volume but not a definae shape
Term
Mass
Definition
a measure of the amount of the matter in an object
Term
Mass Number
Definition
the sum of the numbers of protons and neutrons in the nuclues of an atom
Term
Matter
Definition
anything that has a mass or takes up space
Term
Melting
Definition
the change of state in which a solid becomes a liqid by adding heat
Term
Meniscus
Definition
the curve at a liqid's suface by witch one measures the volume of the liquid
Term
Metal
Definition
a element that is shiny and that conducts heat and electricity well
Term
Metalloid
Definition
elements that have propertys of both metals and nonmetals
Term
Mixture
Definition
a combination of two or more substances that are not chemicly combined
Term
neutron
Definition
a subatomic particle that has no charge and that is found in the nucleus of an atom
Term
nonmetal
Definition
an element that the conduct heat and electricity poorly
Term
nucleus
Definition
in physical science, an atom's centeral region, which is made up of protons and neutrons
Term
Period
Definition
in chemistry, a horizontal row of elements in the perodic table
Term
Periodic
Definition
describes something that occurs or repeats at regular intervils
Term
Periodic Law
Definition
the law that states that the repeating cemical and periodic properts of elements change perodicly with the atomic number of the elements
Term
Physical Change
Definition
a change of matter from one form to another without a change in chemical propertys
Term
Physical Property
Definition
a charicteristic of a substance that does not involve a chemical change such as denity color or hardness
Term
Proton
Definition
a subatomic partical tht has a positive charge and that is found in the nucleus of an atom
Term
Solid
Definition
the state of matter in witch the volume an shape of a substance are fixed
Term
Solubility
Definition
the ablity of one substance to disolve in another at a given tempiture and presure
Term
Solute
Definition
in a soultion the substance that disolves in the solvent
Term
Solution
Definition
a homogeneous mixture of two or more substances uniformly dispersed throughout a single phase
Term
Solvent
Definition
in a soultion the substance in which the soluvent dissolves
Term
State Of Matter
Definition
the physical forms of mater which include solid liquid and gas
Term
Sublimation
Definition
the process in witch a solid changes directly into a gas
Term
Surface Tension
Definition
the force that acts on the surcae of a liquid and that tends to minimize the area of the surface
Term
Suspention
Definition
a mixture in witch particles of a materials are more or less evenly dispersed throughtout a liquid or gas
Term
Temperature
Definition
a meause of how hot or cold something is; specificly a measure of the average kinetic energy of the particles in an object
Term
Viscosity
Definition
the resistence of a gas or liquid to flow
Term
Volume
Definition
a measure of the size of a body or region in three-dimentional space
Term
Weight
Definition
a measure of the gravitational force exerted on an object; it's value can change with the location of an object in the universe
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